JP6115503B2 - Groove copying roller and inner surface welding machine equipped with the same - Google Patents

Description

  The present invention relates to a groove following roller and an inner surface welding machine including the groove tracking roller, and in particular, the invention is applicable to an inner surface welding machine for seam welding of a large-diameter welded steel pipe manufactured by a UOE steel pipe or a bending press.

  FIG. 1 is a diagram showing the configuration of a general UOE steel pipe inner surface welding machine. As shown in FIG. 1, in the inner surface welding of a UOE steel pipe, an inner surface welder 2 is fed into the UOE steel pipe 1 and the inner groove 5 (FIG. 2) is submerged arc welded. The inner surface welding machine 2 is provided with a groove following roller 4 for reducing the displacement between the inner surface groove 5 and the welding electrode 3 in front of the welding electrode 3 in the welding direction.

  FIG. 2 is a cross-sectional view of the tip of the groove following roller 4 of FIG. 1 as viewed from the welding direction. When performing welding, as shown in FIG. 2, the copying roller 4 of the inner surface welding machine 2 is fitted on the inner surface groove 5 and moved on the inner surface groove 5.

  However, the groove scanning roller 4 shown in FIG. 2 has a problem that the groove scanning roller 4 rides on the foreign material when there is a foreign material at the groove tip.

  On the other hand, in Patent Document 1, although it is not a groove copying roller of an inner surface welding machine, it moves following the groove to a device that fills the groove space with a filler material prior to groove welding. Providing a roller is disclosed. In Patent Document 1, the shape of the roller is configured such that the cross-sectional shape of the tip when viewed from the traveling direction is a trapezoid, and the trapezoidal slope of the roller and the outer edge of the groove (the outer surface of the steel pipe) are brought into contact with each other. Thus, a gap is formed between the tip of the groove and the tip of the roller, and even when there is a foreign object at the groove tip, the roller is not easily ridden on the foreign object (see FIG. 4 of Patent Document 1). b) Description paragraph [0047]).

Japanese Patent Laid-Open No. 10-249528

  However, in the roller disclosed in Patent Document 1, since the trapezoidal slope of the roller is in contact with the steel pipe at the shallow groove position, specifically, the outer edge (inner surface of the steel pipe) of the inner groove, the roller is in the groove. There is a problem that it is easy to shift in the width direction.

  The present invention has been made to solve such a problem, and is a groove-following roller that is difficult to shift in the width direction of the groove and can stably perform inner surface welding, and an inner surface welding machine equipped with the roller. The purpose is to provide.

The present invention has been made to solve such problems, and has the following features.
[1] A groove copying roller installed in an inner surface welding machine of a welded steel pipe,
At the time of inner surface welding, the cross section of the tip viewed from the welding progress direction is not in contact with the inner surface of the steel pipe and is symmetrical with respect to the center line in the groove width direction of the groove copying roller from the groove tip. A groove copying roller having a shape in contact with the groove processing surface at two points on the left and right between the inner surfaces of the steel pipe.
[2] The groove copying roller according to [1], wherein a line connecting two points in contact with the groove processing surface is in a range from the groove tip to ½ of the groove depth.
[3] The cross-sectional shape of the tip viewed from the welding progress direction is a trapezoid or rectangle whose short side is located on the groove tip side, and touches the groove processing surface at the apex of the trapezoid or rectangle [1] or [2 ].
[4] The groove following roller according to [1] or [2], wherein the cross-sectional shape of the tip viewed from the welding progress direction is a curved shape convex toward the inner groove side.
[5] An inner surface welding machine provided with the groove copying roller according to any one of [1] to [4].

  According to the groove following roller according to the present invention and the inner surface welding machine equipped with the roller, the inner surface welding can be performed stably without being displaced in the width direction of the groove.

It is a figure which shows the structure of the internal welder of a general UOE steel pipe. It is a figure which shows the shape of the conventional groove copying roller. It is an enlarged view of the front-end | tip part of the groove copying roller which concerns on Embodiment 1 of this invention, (a) is a figure which shows the positional relationship of the groove copying roller and UOE steel pipe at the time of inner surface welding, (b) These are the figures which isolate | separated and showed the groove tracing roller and the UOE steel pipe for description. It is the figure which showed a mode that the inner surface groove | channel was deep and the inner surface welding of a UOE steel pipe was performed using the groove | channel scanning roller which concerns on Embodiment 1 of this invention. It is the figure which showed a mode that the inner surface welding of a UOE steel pipe with a shallow inner surface groove | channel and a foreign material in a groove tip was performed using the groove | channel scanning roller which concerns on Embodiment 1 of this invention. It is an enlarged view of the front-end | tip part of the groove copying roller which concerns on Embodiment 2 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[Embodiment 1]
3 (a) and 3 (b) are enlarged views of the leading end portion of the groove copying roller according to Embodiment 1 of the present invention. 3A and 3B are cross-sectional views of the groove copying roller 11 as seen from the welding progress direction. FIG. 3A is a diagram showing a positional relationship between the groove copying roller 11 and the UOE steel pipe 1 during inner surface welding, and FIG. 3B is a diagram illustrating the groove copying roller 11 and the UOE steel pipe 1 for explanation. It is the figure which isolated and showed.

  The groove following roller 11 according to Embodiment 1 is installed in an inner surface welding machine 2 as shown in FIG. The groove copying roller 11 is configured to be line-symmetric with respect to the center line C in the groove width direction of the groove copying roller 11. As shown in FIG. 3A, the groove-following roller 11 has a trapezoidal tip A (see FIG. 3B) accommodated in the inner groove 5 of the UOE steel pipe 1 during inner surface welding. Is formed.

  The left and right oblique sides of the trapezoid are 11b, the short side is 11c, and the apex on the groove tip 5a side is 11d. The groove following roller 11 is arranged so that the trapezoidal short side 11c is on the groove tip 5a side, that is, taper toward the groove tip 5a. A gap is formed between the groove tip 5 a and the short side 11 c of the groove copying roller 11.

  In the groove copying roller 11, the inner surface is welded so that the cross-section of the tip viewed from the welding progress direction does not contact the inner surface (outer groove edge) 5b of the steel pipe, and the groove width of the groove copying roller 11 It is configured so as to be in contact with the groove processing surface at two points on the left and right between the groove tip 5a and the steel pipe inner surface 5b, symmetrically with respect to the direction center line C.

  Specifically, the groove following roller 11 is in contact with the groove processing surface of the UOE steel pipe 1 at the left and right vertices 11d of the trapezoid of the tip end portion A.

  A line connecting the left and right two points where the groove scanning roller 11 is in contact with the groove processing surface (corresponding to the short side 11c which is a line connecting the vertex 11d in the first embodiment) is the groove scanning roller 11 is the inner surface groove. 5, the groove depth is set to D, and the groove depth is in a range from the groove tip 5a to the groove depth 1 / 2D (see FIG. 3B). Here, the height from the groove tip 5a of the line connecting the left and right two points where the groove copying roller 11 is in contact with the groove processing surface is a viewpoint for avoiding this when a foreign object exists near the groove tip 5a. Therefore, it is preferably 0.2 times or more of the groove depth D.

The angle between the trapezoidal hypotenuse 11b of the tip A of the groove scanning roller 11 and the center line C in the groove width direction of the groove scanning roller 11 is θ _M, and the groove angle of the inner surface groove 5 of the UOE steel pipe 1 1/2 When theta _N of the angle theta _M is smaller than the angle theta _N.

  Next, the effect of the groove copying roller 11 according to the first embodiment configured as described above will be described with reference to FIGS.

  FIG. 4 is a diagram showing a state in which inner surface welding of a UOE steel pipe having a deep inner surface groove is performed using the groove copying roller according to the first embodiment of the present invention.

  In the groove copying roller 11 according to the first embodiment of the present invention, the groove tip is symmetrical with respect to the center line C in the groove width direction of the groove copying roller 11 in the cross-sectional view seen from the welding progress direction. It contacts with the groove processing surface at two points (vertex 11d in FIG. 3) between 5a and the inner surface 5b of the steel pipe. Thereby, as shown in FIG. 4, when the inner surface groove 5 is deep, the groove following roller 11 can be stably held in the inner surface groove 5, and the inner surface groove 5 and the groove following roller. 11 centers can be matched.

  Further, by forming a line connecting the left and right two points where the groove following roller 11 is in contact with the groove processing surface in a range from the groove tip 5a to the groove depth 1 / 2D, the inner surface groove 5 is deep. The groove following roller 11 can be stabilized at the position, and the deviation in the groove width direction can be reduced. Thereby, inner surface welding more stable than before can be realized.

  FIG. 5 is a diagram illustrating a state in which inner surface welding of a UOE steel pipe having a shallow inner surface groove and a foreign object at the groove tip is performed using the groove copying roller according to the first embodiment of the present invention. .

  In the groove following roller 11 according to the first embodiment, the inner surface groove 5 is shallow because it contacts the groove processing surface at two left and right points (vertex 11d in FIG. 3) between the groove tip 5a and the steel pipe inner surface 5b. Even when the foreign object 6 is present at the groove tip 5a, the tip of the groove copying roller 11 does not ride on the foreign object 6, and the center of the inner surface groove 5 and the groove copying roller 11 can be made coincident.

  In the above description, the shape of the tip A of the groove following roller 11 is assumed to be a trapezoid, but the shape of the tip A of the groove following roller 11 may be a rectangle. In this case, what is necessary is just to comprise so that two vertexes by the side of the rectangular groove front-end | tip 5a may contact | connect a groove processing surface.

[Embodiment 2]
FIG. 6 is an enlarged view of the front end portion of the groove copying roller according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view of the groove copying roller 12 according to the second embodiment of the present invention as seen from the welding progress direction. In the groove following roller 12 according to the second embodiment, the shape of the tip end portion A accommodated in the inner surface groove 5 of the UOE steel pipe 1 at the time of inner surface welding is formed in a curved shape convex toward the inner surface groove side. The curved line convex toward the inner face groove is not particularly limited, and for example, a circle, an ellipse, a parabola, a hyperbola, or the like can be used.

  The groove following roller 12 according to the second embodiment is configured symmetrically with respect to the center line C in the groove width direction of the groove following roller 12. The groove copying roller 12 is not in contact with the inner surface (outer groove edge) 5b (see FIG. 3) of the steel pipe, and is symmetrical with respect to the center line C in the groove width direction of the groove copying roller 12. The groove processing surface is in contact with the left and right two points (contact point 12d) between the groove tip 5a and the steel pipe inner surface 5b.

  Thus, even if the shape of the tip A is a curved shape convex toward the inner surface groove side, the groove following roller 12 can be made to follow the inner surface groove 5 stably.

  As in the first embodiment, when the groove copying roller 12 follows the inner surface groove 5, a line connecting the two left and right points (contact point 12d) at which the groove copying roller 12 contacts the groove processing surface. The groove tip 5a is preferably configured to be within a range of ½ of the groove depth D.

  In this way, by holding the groove copying roller 12 at a deep position of the inner surface groove 5, the groove copying roller 12 is not easily displaced in the width direction of the inner surface groove 5, and stable inner surface welding can be performed. .

  In the first and second embodiments, the shape of the groove copying roller has been described. However, the present invention can of course be implemented as an inner surface welding machine including the groove copying roller according to the first and second embodiments. It is.

  Further, the present invention is not limited to the above-described embodiment, and various design changes can be applied.

  As the inner surface welding copying roller of the UOE inner surface welding machine, the conventional groove copying roller shown in FIG. 2 and the groove copying roller according to Embodiment 1 of the present invention shown in FIGS. 3A and 3B are applied. The effect of the present invention was verified.

  The applied material subjected to the inner surface welding is UOE steel pipe 1 having an outer diameter of 18 inches to 56 inches and a pipe thickness of 6.0 mm to 50.8 mm.

  As a result, in the example of the present invention, the yield was improved by 0.2% compared to the comparative example. Thus, it has been found that by applying the present invention, the center of the groove copying roller and the inner surface groove can be matched well, and the yield can be improved.

DESCRIPTION OF SYMBOLS 1 UOE steel pipe 2 Inner surface welding machine 3 Welding electrode 4 Groove scanning roller 5 Inner surface groove 5a Groove tip 5b Steel pipe inner surface (edge outside groove)
6 Foreign object 11 Groove scanning roller 11b Oblique side 11c Short side 11d Vertex (contact point)
12 groove scanning roller 12d contact

Claims (5)

A groove copying roller installed in a welded steel pipe inner surface welding machine,
At the time of inner surface welding, the cross section of the tip viewed from the welding progress direction is not in contact with the inner surface of the steel pipe and is symmetrical with respect to the center line in the groove width direction of the groove copying roller from the groove tip. have a shape that is in contact with GMA working surface at right and left two points between the steel pipe inner surface,
Line connecting the two points in contact with the beveling surface is a range near Ru groove profiling rollers from groove tip to half the groove depth. 2. The groove following roller according to claim 1, wherein the height from the groove tip is at least 0.2 times the groove depth at the position of a line connecting two points in contact with the groove machining surface.   3. The opening according to claim 1, wherein a cross-sectional shape of the tip as viewed from the welding progress direction is a trapezoid or a rectangle whose short side is located on the groove tip side, and is in contact with the groove processing surface at the apex of the trapezoid or the rectangle. First copying roller.   3. The groove-following roller according to claim 1, wherein the cross-sectional shape of the tip viewed from the welding progress direction is a curved shape convex toward the inner surface groove side.   An inner surface welding machine provided with the groove copying roller according to any one of claims 1 to 4.

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